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20. The five recognized periods of mass extinction have- *
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20. The five recognized periods of mass extinction have- *

User Dariusz Wasacz
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Answer:

1. Ordovician Mass Extinction (about 44o million years ago)

2. Devonian Mass Extinction (about 375 million years ago)

3. Permian Mass Extinction (about 250 million years ago)

4. Triassic-Jurassic Mass Extinction (about 200 million years ago)

5. Cretaceous-Tertiary Mass Extinction (about 65 million years ago)

Step-by-step explanation:

User Slim Fadi
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